Incorporating what you've added as input:

New Code

$data =~ s{                # First, we'll list things we want 
                           # to match, but not throw away
  (
    (?:/[^\r\n\*\/]+/)                     # Match RegExp
    |                                      # -or-
    [^"'/]+                                # other stuff
    |                                      # -or-
    (?:"[^"\\]*(?:\\.[^"\\]*)*" [^"'/]*)+  # double quoted string
    |                                      # -or-
    (?:'[^'\\]*(?:\\.[^'\\]*)*' [^"'/]*)+  # single quoted constant
  )
        
  |
       
  # or we'll match a comment. Since it's not in the
  # $1 parentheses above, the comments will disappear
  # when we use $1 as the replacement text.
      
    /                      # (all comments start with a slash)
    (?:                           
    \*[^*]*\*+(?:[^/*][^*]*\*+)*/ # traditional C comments
    |                             # -or-
    /[^\n]*                       # C++ //-style comments
    )
          
}{$1}gsx;
[download]

Updated

This code does work for the above examples, but does not work for regular expressions with containing a '*', for example.

var b=/\s*;\s*/gi;
[download]

There should be a way for us to do this, because we want to handle that 99% of code that is out there... without writing a parser...

I'm thinking we need to modify the regex in the "# Match RegExp" section further, to ignore *s and \/s... this may not be easy, and if I figure it out, I'll post it here.

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